...

src/calibre/gui2/library/models.py

@@ -1368,6 +1368,8 @@ def data(self, index, role):
                 return QVariant(authors_to_string(au))
             elif cname == 'size':
                 size = self.db[self.map[row]].size
+                if not isinstance(size, (float, int)):
+                    size = 0
                 return QVariant(human_readable(size))
             elif cname == 'timestamp':
                 dt = self.db[self.map[row]].datetime

src/calibre/web/fetch/simple.py

@@ -549,7 +549,7 @@ def option_parser(usage=_('%prog URL\n\nWhere URL is for example http://google.c
 
 def create_fetcher(options, image_map={}, log=None):
     if log is None:
-        log = Log()
+        log = Log(level=Log.DEBUG) if options.verbose else Log()
     return RecursiveFetcher(options, log, image_map={})
 
 def main(args=sys.argv):